[Issue 24425] @standalone attribute should be usable on thread-local static constructors and all static destructors

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24425

--- Comment #1 from Steven Schveighoffer <schveiguy at gmail.com> ---
Static destructors can also benefit from being marked standalone, though the
use case isn't as compelling. However, there is no reason to disallow it. A
standalone destructor would be run last when sorting ctors/dtors (this
naturally already happens).

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